Think you’re having a bad day when someone heckles you on a run? Try going for a jaunt in Oxford University student Goudarz Karimi’s shoes. Earlier this week, police saw him running with a weight vest and told him to stop, drop to the ground, and put his hands up. They pointed submachine guns at him.

To them, he looked like a suicide bomber.

But he was only wearing a gadget similar to that used by England’s Prince Harry himself–a popular exercise accessory that adds weight resistance.

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